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Use this two-part accessory in several configurations to increase the focal length of the objective for high-power visual observation and lunar-planetary photography. We do not recommend the Barlow for deep-sky photos when using a scope that has a fast focal ratio. These photos will exhibit significant field curvature, which will limit the usable portion of the negative. |
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The 2-element design uses special glasses to preserve the fine color correction of the main objective. The optical elements are hand-corrected and precision centered to insure that no aberrations are introduced into the system. The Barlow focal length is 127 mm which is longer than conventional types. This minimizes the divergence of the edge rays and therefore reduces the apparent vignetting common in many eyepieces (Plossls and Panoptics). The Barlow features a brass locking ring as described for the 2.7" focuser. Note the following positions and resulting magnifications: 1.7x after the diagonal |
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| BARCON | $210.00 | in stock | ![]() |
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The Astro-Physics 2" MaxBright Diagonal was designed with several unique features to provide optimum performance and years of use. |
Advantages of the Astro-Physics Dielectric Coatings: Mechanical Features The diagonal is accurately square to the optical axis due to the CNC machined parts and special mounting method of the mirror. The baffles and flat black interior allow maximum contrast. It is threaded for 48m filters so that you can change eyepieces with ease without changing the filter. Consider these dimensions to be sure that the barrel of your accessories will not strike the mirror. When using 2" accessories, the depth from the top of the diagonal to the mirror surface is 1.85". When using 1.25" accessories, the depth from the top of the diagonal to the mirror surface is 2.25"; our 1.25" adapter adds another 0.25" height. Remember that if you add filters to your eyepiece barrels, the overall length changes. The total optical path length is 4.1", comprised of 2.75" from the center of the ocular opening to the mirror and 1.35" from the center of the objective opening to the mirror. |
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| PMDMAX | $290.00 | in stock | ![]() |
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Our imported finder features a crosshair eyepiece , which can be illuminated with the matching self-contained, battery-powered LED. The eyepiece provides a wide 5.6º field of view to assist you in locating your favorite objects. The finder is black and includes a dustcover for the lens and a built-in dewcap. The rheostat control on the illuminator allows you to control brightness of the reticle. You will really appreciate the handy quick release finder bracket, which is described below. |
| 850STI | $175.00 | in stock | ![]() |
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The quick release finder bracket was developed by Astro-Physics to make your life easier. Now, you can attach and detach your finder in seconds while retaining the alignment. The base of the bracket mounts onto the predrilled holes of your Astro-Physics refractor. It can also be used with most other commercial telescopes, since the spacing between the holes of most finder brackets is the same. The remainder of the assembly with the finderscope slips into the groove of the base bracket and tightens quickly with two thumbscrews. Now you are ready to go! Weight: 7.4 oz (.23 kg) |
| There are no mounting screws to get lost in the grass or snow and your fingers won't freeze as you struggle with tools. To use with the Traveler accessory plate (ACPLTR), attach the bracket part to the 7" sliding bar (SB0800). This accessory is a must!
You may want to consider purchasing extra bases that you can mount permanently on your other telescopes. This will allow you to use the same bracket and finder interchangeably. This bracket can be used with our 8x50 Straight-through Finder above or other similar finder that you may already own. |
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| 850QRB | $60.00 | in stock | ![]() |
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You can mount this extra base onto another telescope so that you can use the Quick Release Finder Bracket interchangebly or attach a base to the opposite side of your refractor so that you can use a modified TeleVue StarBeam (STARMD) or Qwik Point (QWIKMD) finders (we add our part #A3251-B male dovetail piece that allows these finders to be used with the base). Weight: 2.1 oz (.07 kg) |
| QRBASE | $32.00 | in stock | ![]() |
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This page was last modified:
November 2, 2006